Bar screen



Al1g- 30, 1932. E. R. scHFxELD ET Al. 1,874,126

BAR SCREEN Filed DSC. 26, 1929 EdvvinFEEI-mfi 21d Einhand Kramar'mf f- Patented Aug. 3G, 1932 naires, stares Parenti' wonirica EDWIN`R. SCHOFIELD ANI) RICHARD KRAMAROFF, OF PHILADELPHIA, PENNSYLVANIA BAR SCREEN Application filed December 26-19 29. ySerial No. 416,609.

ing thereover for simultaneouslyV cleaning both'tlie tine and coarse bars of the screen.

A further objectv of this invention is the provision of an improved coarse and line bar screen structure wh? ch enables the collecting of minute detritus from flowing bodies ofA liquid, in such a relation that heavier objects may only engage with the coarserscreens to prevent damage to the fine bars.

A further object of this` invention is the provision of a combination line and coarse bar. screen in which the partsare assembled y ina very durable, well braced, and easily accessible relation. l

A further object of this invention is the provision of an improved segmental type of combination line and coarse bar screen, in

\ which. the parts are so arranged as to give the screen great strength so that turbulent wa-V ters flowing therethrough will not be to bend or distort the fine bars. v

Other objects and advantages of this invention will be apparent during the course of the following detailed description.

ln the drawing, wherein for the purpose of i illustration is shown only a preferred einbodiment of the invention.

Figure l is a fragmentary plan view showing the relation of the bars of the improved screen with respect to an improved raking head of a movable rake structure.

Figure 2 is a vertical sectional view taken through the improved screen, showing the able.

move over a screen operative relation of a rake head of amovable screen therewith. f

Figure 3 is a fragmentary's'ectional view showing the relation of details -of the line and coarse bar screen at a corner of the base mounting thereof.

Figure 4 is an enlarged fragmentary sectional View showing a-"relative arrangement of the coarse and line bars of the screen, in relation to an improved toothed or comb arrangement of a movable raking head which simultaneously cleans both the fine and coarse bars. l y

Figure 5 is a fragmentary sectional view taken at one of the Asupporting points of the screen structure, showing the relation of coarse and line bars, and the operative relationof an improved raking head.

In the drawing, wherein similar reference characters designate corresponding parts throughout the several views, the letter A may generally designate the improved screen structure, voverwhich an improvedcollecting or raking head B of a movable rake C may cooperate in a novel relationship.

The movable rake C may be Vof any ape proved type, such as set forth in our application, Serial No. 318,227, filed November 9, 1928, or our co-pending application, Serial No. 416,608, filed December 26, 1930, orit may be of any othermovable type which enables a'raking comb, head, or collecting tritus or collections thereform. Suffice to say that the rake C'includes a supporting beam on the outer end of which a transversely arranged raking head, member, orA collecting plate B is positioned, which lis relatively broad, and over which ejecting means D may operate as more specifically detailed in our applications above referred to.

The screen A preferably comprises a plurality of segmental shaped coarse Hat metal bars 15, which may be of any approved thickness or width, and which in cross section are part to for theremovalof de-V Y and at the sides of the screen the bolts or supporting members 19 may be secured to the side coarse bars 15, as by countersunk rivet heads 2l, shown in Figure 4, or in lieu thereof a bolt and screw threaded connection may be provided, as desired. The screen is of con# siderable length and may be split up into sec. tions, and the .sections bolted together -topro-` vide a screen of any desired width. On the bolts or supports 19 between the coarse bars 15 of the screen, spacing sleeves 22 are provided, which hold the coarse bars15 in predetermined spaced parallelism inthe screen structure. These sleeves 22 are provided with slots 25 extending transversely there through and intersecting the passageways thereof through which `the bolt pins entend, so as to expose a segmental portion of the bolt 19 in each ofthe slots 25 when the sleeves are slipped thereon, as can readily be seen from Figures 4 and 5 of the drawing.

. The fine bars of the screen structure are very appreciably thinner than the coarse bars 15, and intended to be so closely spaced that they will catch minute particles of detritus from a liquidbody which is being screened. These bars 30 are very thin, prefl erably of metal, and they areof a width appreciably less than the width of the coarser bars`15. Due to the iineness of the Abars 30, they cannot be made of one-piece lengths, the same as the coarser bars 15, since itis imprac-V tical not only from a manufacturing standfkpoint, but from a standpoint of l support. Therefore, itis preferred to make the fine bars in a plurality of sections, with the ends of the sections supported on adjacent spaced sleeves 22 and on the bolts 19 received there through. Thus, as shown in Figure 2, the

fine screens 3() comprise a plurality of sect-ions 30,V the ends of which increase in w1 dth, Vas better shown in Figure 5 at 30h, and which are e formed so that one edge rests against the bottom of a slot 25 in the sleeve 22, and the end edge 36 thereof rests against a similar end edge of a next adjacent section 30a 'of the line screen.` The division edges 36 of the sections constituting a line bar are radially arranged with respect to the airis of the shaft 19,`as more particularly shown iii Figure 5. The sections 30a are forced into their slots 25, and frictionallyheld therein, and of course they are supported at their ends due to the notching at 41 where they fit over the supporting pins or bolts 19, as shown in Figure 5. The flow of liquid is in the direction shown in Figure 2, normally assisting in maintaining the fine bars in position.

The improved screen structure A is sup ported near the upper end thereof against a transverse beam 45, which at the ends thereof may be anchored in suitable side walls 46 of a channel through which the liquid is iow ing, which is to be screened. This beam may be of channel shaped section, and the web thereof may be suitably apertured, as`

shown in Figure 4, for receiving extensions 47 of certain of the sleeves 22, which may be bolted as at 48 to the beam 45, in order to'` hold the screen in position. At its lower end the 'screen rests on a suitable cementitious or other foundation'-50, which may be suitably notched at 51 for receiving the lower ends of the coarse bars l5 therein. The foundation 5G' may be similarly notched for the finer bars if desired. i

The relation as to width, of the fine and coarse bars of the finished screen, is shown in Figure 4; It is to be noted that the ends 60 of the coarse bars project considerably be# yond the ends 61 of the finer screen bars 30. t is to be seen that a large number of the fine bars may kbe placed in each of the spaces between adjacent coarser bars 15, and if des-ired the screen facing edges of the line bars may be chiseledged, as may also the coarser bars if desired. Itis readily understandable that solid particles which would ordinarily dama-ge the finer screens will be caught against thefforwardly projecting ends of the coarser bars and will not contact against the liner bars; although the latter will function to collect the finer detritus passing through the spaces between the coarser bars 15.

The rake or collecting member B is formed in a novel toothed relation for simultaneously cleaning the spaces between both the coarse and ne barsof the screen. To this end, the` collecting head B is provided with project-V ing portions 70, adapted to entend into the spaces between the projecting ends of the coarser bars l5, and each of these projectingr portions T0 is furthermoreprovided with a plurality of fine teeth 72, shown in Figure 4 of the drawing, extending materially into the spaces between adjacent Yfine bars 80, for` combing said spaces and collecting" detritus and foreign deposits therefrom. The pro'- jections 72 maybe point-ed, if desired, to accomplish this purpose. It is to be noted that there is a close and intimate internieshing of the projections and teeth of the movable raking head B in the spaces between the coarse and fine bars, so that a simultaneous cleaning' of both the fine and coarse bars will take place during a raking action of the head Bf The structure F, shown in Figure 2, comprises means for removing the detritus after it is discharged from the collecting head B by the ejector D, as hasbeen described in detail in my co-applications above mentioned.

Various changes in the shape, size, and arrangement of parts may be made to the form of invention herein shown and described, without 'departing from the spirit of the invention or the scope of the claims.

We claim:

1. A screen comprising a plurality of relatively coarse'detritus collecting bars, means to support said bars in spaced relation, and a plurality of fine bars appreciably finer than the coarser bars protectively mounted in each of the spaces on the screen between the adj acent coarser bars.

2. A screen comprising a plurality of relatively coarse detritus collecting bars, means to support said bars in spaced relation, a plurality of fine bars appreciably finer than the coarser bars mounted in each of the spaces on the screen between the adjacent coarser bars, the detritus collecting edges of the coarser bars projecting ina protecting relation beyond the detritus collecting edges of the ner bars. y

8. A screen comprising a plurality ofV relatively coarse detritus collecting bars, means to support said bars in spaced relation, fine bars appreciably finer than the coarser bars mounted in the spaces on the screen between the coarser bars, the detritus collecting edges of the coarser bars projecting in a protecting relation beyond the detritus collecting edges of the finer bars, and rake apparatus including a rake head provided with a toothed structure for simultaneously cleaning the` detritus collecting edges of both the coarse and fine bars of the screen.

4. In a screen structure of the class described the combination of a plurality of coarse bars, means holding saidv bars in detritus collecting parallelism, and a plurality of parallel fine screen bars carried on said last mentioned means in a. protected relation in each of the spaces between adjacent coarse bars of the screen.

5, A combinationcoarse and fine barv screen comprising a plurality of coarse bars, supporting means connecting and spacing said coarse bars, and sectional fine scneen bars mounted in close multiple relation in each of the spaces between the coarse bars upon said means which mounts and spaces said coarse bars. y

6. A screen of the class described having coarse bars, a transverse pin extending through said coarse bars, sleeves on the pin between said coarse bars to hold them in properly spaced relation, said sleeves having slots therein, and a plurality of fine bars supported in said slots in each of the spaces between adjacent coarse bars.

7. A screen of the class described having coarse bars, a transverse pin extending lecting edges.' of the -fine bars being spaced inwardlyof thedetritus collecting edges of the coarse bars. i

8.,v In a segmental screen' the combination of a plurality of arcuate coarse bars, transverse pins extending through the coarse bars j at intervals therealong, spacer means properly spacing said coarse bars, and ne bars in the spaces between each of the adjacent coarse bars supported upon said pins.

9. In a segmental screen the combination of a plurality of arcuate coarse bars, transverse pins extending through the coarse bars at intervals therealong, spacer means properly spacing said coarse bars, `fine bars in the spaces between each of the adjacent coarse bars supported upon said pins, each of said finejbars being sectional, with the ends of the sections resting on kthe pins.y Y

10. In a screen the combination of a plurality of coarse screen bars, spacingV sleeves betweenV the bars, fine screen means, and means mounting said line screen means upon said spacing sleeves in affixed relation in the spaces between adjacent coarse bars.

l 11. lin a screen the combination of coarse screen bars, transverse pins through the coarse screen bars, spacing sleeves slipped on said pins and spacing the coarse bars from each other, the said sleeves having slots transversely therethrough in closely spaced relation intersecting the passageways therethrough through which the m5 pins extend so that segments of the pins extend into each of said slots of the sleeve, and fine bars having portions extending into the slots of said sleeves between the coarse bars, said portions being notched to receive the segmental portions of the pins therein.

12. A screen comprising a plurality of relextending Y nsY atively coarse detritus collecting bars mounted in spaced relation for the collection thereagainst of heavy detritus, and a plurality of finer bars appreciably finer than the coarser bars protectively mounted inV each of the .spaces of the screen between adjacent coarser bars with their detritus collecting edges set inwardly of the detritus collecting edges of the coarser barsfor the collection of finer detritus which passes into the spaces between the coarser bars.

13. A screen comprising a plurality of relatively coarse detritus collecting bars mounted in spaced relation for the collection thereagainst of heavy detritus, a plurality of finer bars appreciably finer than the coarser bars protectively mounted in each of the spaces of the screen between adjacent coarser bars with their detritus collecting edges set in- Wardly of the detritus collecting .edges of the coarser bars for the collection of hner detrtus` Which passes into the spaces lbetween the coa-rser bars, and a rake apparatus operatvely movable over the screen including a rake head having a toothed structure for simultaneously cleaning the detritus collectngedges of both the coarse and ne bars of the screen.

EDWIN R. SCHOFIELD. RICHARD KRAMAROFF. 

